Pneumatic hammer.



^ PATENTE) ocT.1, 1 907.v

No. 867,353. l

\\A.J.D0UGHTY. PNBUMATIG HAMMER. l

APPLIUATIO FILED LUG. l5, 1905.

PATENT OFFICE. l

ALFRED l. DOUGHTY, 0F DETROIT, MICHIGAN.

PNEUMATIG HAMMER..

Specification of Letters Patent.

negated oct. 1, 1907.

Application filed August 15, 1905. Serial No. 274,262.

To all whom dit may concern:

Be it known that I, ALFRED l. DOUGHTY, a citizenv ofthe United States, residing at Detroit, in the county `of Wayne and State of Michigan, have invented certain new and useful Improvements in Pneumatic Hammers, of which the following is a specification.'

My invention relates to improvements in pneumatic hammers of that type known as plug drills, inlwhich the drill which receives the blows of the hammering piston of the pneumatic hammer is turned or rotated, `in the present instance such rotation being manual.l

The object of my invention is to provide a simple and efiicient means -for thus rotating the drill or tool and at the sam'e time providing for the connection or clamping (in rotatable relation) of the cylinder or barrel of' the hammer and the nose-piece which carries or receives the drill. 7

The various features of advantage and utility of my form oi construction will be apparent from the description hereinafter-given. v

In the accompanying drawing, Figure l is aside elevaron of a plug drin with' the forward end of the hammer proper and also the nose-piece of the combined handle and clamp shown in section; Fig. 2 a lsectional elevation on the line 2-2 of Fig. 1, and Fig. 3 a section on the line 3-3 0i Fig. 2.

. It will be understood that my invention relates to simple and suitable means for efliciently rotating the nose-piece, which carries the drill and for connecting such nose-piece to the barrel or cylinder of the hammer proper and consequently, as is evident, my invention may be.applied to pneumatichammers of different styles and makes, .and therefore the following description is given oi my invention in connection with the particular form of hammer shown and described, without any intention of limitation thereto. Referring to the pneumatic hammer illustrated in the drawing, the same comprises essentially the cylinder or barrel A having a piston chamber in which travels or'reciprocates the piston B, and which is furtherr provided with a grasping handle C secured to its rearward end. The front end of the cylinder-is provided with an opening or bore to receive the shank of the drill B between whose inner end and the hammering tip or extension oi the piston is arranged a block E located within said bore at the iront end oi the cylinder. The 'nose-piece F is a cylindrical socket Vpiece `larranged to fit over the iront end of thecylinder and' the same is provided ,at its `front end with a longitudinal bore which is angular so as to receive the correspond ing angular shank of the drillD.

As hereinbeiore stated, my invention comprises means forrotating the nose-piece and consequently rotating the drill and alsofor connecting the nose-piece to the cylinder. According to the present embodiment of my invention, the means referred to is an operating'.

piece comprising a combined clamp and 'rotating element or device. The rotating device and clamp consists, asshown in the drawing, or' a circular yoke or strap Gr of suitableV material and oi a size to properly ca'use the clamping of the nose-piece and cylinder in a manner hereinaiter explained.' One end of the yoke or strap terminates in the handle g, while the other end terminates in a lug or ear g extending parallel to the longitudinal axis ol' the handle and adjacent to one side thereof. Within the strap or yoke.

is arranged a two-piece split collar lzl adapted vto be y clampedsecurely to the nose-piece and itting' over the cylinder to connect them together. For the purpose of thus clamping the split collarupon the nosepiece so as to grip the latter and cause it to turn with the handle, I employ the single bolt or screw I passing through the handle and through the lug g and engaging a lock nut i set into the lug, with the result that when the screw I, having a screw-driver head, is turned, the yoke lor clamp is tightened or loosened according to the direction of rotation of such screw. By preference, the nut i is split and taperedand fits in a taper bearing or recessl in the lug g or end of the clamp whereby an eflicientlock is formed in asmuch as the nut is pinched together when the screw is tightened.

As indicated in Figs. 1 and 3, the nose-piece F is. provided with an end shoulder f which faces forwardly,j and is engaged by a rearwardly facing shoulder h orf the inner face of the split collar and likewise the collar and strapiare held against displacement by groove and flange connection, such as the groove q'L on the inner-,face oi the strap receiving the iange h en the outer face of the collar, with the result that when the parts are assembled, as shown in Fig. l, the nose-piece is held securely against longitudinal movement with respect to the clamping and rotat- For-the purpose of clamping or connecting the nose-piece to the cylinder' and yet permit such nose-piece to rotate on the latter, 'the split collar is provided with an annular inturned flange H1, which is adapted to be received within an annular groove a formed towards the front end of the cylinder A and lat right angles to thelongitudinal axis of the hammer. 'i

By theuse of my invention the nose-piece is enabled to be rotated by a simple device or arrangement-and at the same time by means of the same devicefthe nose-piecev is held or connected toy they cylinder-so that such nose-pieceis permittednto rotate but held v device is under the control oi a single screw by turning 'which in one direction or the other the device may he rendered operative or inoperative at Wii, causing the device to clamp the nose`piece or to loosen it,

therefrom, as the case may be.

I claim; A

adapted td receive a drill or working tool, an operating piece fornengaging and rotating the nose-pige@ and hom; f

ing the same to the cylinder or body of the hammer.

2. In a pneumatic hammer having a rotathble nose-piece arrangedon the front end oi? the cylinder thereof and adapted.` to receive a drill' or working tool, av clamping hendie-auramed, to clamp the nose-piece and having means for connecting the latter with the cylinder or body of the hammer. v

3. In a pneumatic hammer having a rotatable nose-piece larranged. on the front end of the cylinderthereof and adapted to. receiveY a drill or. working tool, of a hand rof tating device comprisingl a rotatable yoke or strap. encircling'the nose-piece and connected therewith and with the cylinder against longitudinal movement, and means for tightening the yokev onto'the nose-piece` to clamp the 4, In. a pneumatic hammer having a rotatable nose-piece arranged 'on the front end of the cylinder thereof and adapted to' receive a drill or working tool, of a hand roratingY dev-ice comprising a yoke or strap encircling1 the nose-pinceand connected therewith and` with; the cylinder against longitudinal. movement.. and a screw engaging said yoke 1or'tlghtenng the yoke onto the nosepiece to clarnlitlie'v same.

5. In a pneumatic hammer having a`rotatablnosepiece arranged; on the front end of the cylinder thereoli and adapted to receive a drill. orgw'orking toohpf "a hand. ro tating'device comprising` a yoke or strap, encircling the Anose-piece and connected therevvith and ivith the cylindei` against longitudinal movement, said yoke having a pro jecting handle, andi a screw engaging' said. handje andan enf 0f the yoke for tightening the yoke onto the nose- .gage the cylinier or body of the hammer and hold the nose-piece in proper relation with such cylinder;

8; Ina pneumatic hammer having a rotatable nosevpiece arranged ort-the frontend of the cylinder thereof and adaptedto receive a drill or working tool, a clamping device encircling the nose-piece and having an inturned Vannular ange, said' cylinder having a correspondingly annular groove to receive the flange, and'. means for clamping, the device upon the nose-piece.

9. YIna pneumatic-hammer having a rotatable nose-piece arranged on the front end of the cylinder thereof'and adaptedI to receive a driii' or working tool, a clamping devine encircling thenose-piece and having anfint-urned. an-

nular flanken-nd, also an internal shoulder-, said cylinder.,

having a corresponding annular groove to receive the flange and thenose-piece having a shoulder to coperate with said shoulder of theclamplng device, and means' for clamping such device upon-.the nose-piece.

10.` Inx a pneumatic hammer having a rotatable nosepiece arranged. on the :iront 'end of the cylinder thereof to receive a. drill or other wrking .tool, a hand rotating de vicel comprising a yoke or strap and a split' collar engaging the nose-piece, said'yoke being arranged to clampl Teac/,eee

the collar onto the nose-piece and menus for operatively connecting the nose-piece to the cylinder.

11. In a pneumatic hammer having a rotatablev nose piece arranged on the front end of the cylinder ihcrcof lo receive e drill or other working tool, a hand rotating dovice comprising a yoke or strap, and u collar mudo in two pieces arranged Within the spoke or strap and engaging the nose-piece,` said yoke being arranged to clamp thc cob 1. In a pneumatic hammer having a rotatable nose-piece .y

arranged onA the `front end of the cylinder thereof and means for operatively connecting` the noso-piero to the cylinder.'

13. In a pneumatic hammer having a rotatable nosopiece arranged on the front end o1' the cylinder thereof lo receivea drill or other working tool, a hand rotating device comprising a yoke or strap, and a split collar havingr a groove `and flange connection with thc nose-picco, said yoke being arranged to clamp the collar ouio the noseA piece and means for operatively connectingr the nose-picco to the cylinder.

14. In a pneumatic hammer having :i rotatable nosopiece arranged on the front end of the cylinder ther-co1" lo receive a drill or other' working tool, :i hand rotating' (le-- vice comprising a yoke or strap, and a split collar havingr :l groove and fiange connection with the nose-picco and also with the yoke or strap, said yoke being arranged to clump thecollar onto the nosepiece and menus for operatively connecting the nose-piece to the cylinder.

15. In a pneumatic hammer having a rotatable noscpiece arranged on the front cud of the cylinder thereof to receive a drill or other working tool, a hand rotating device comprising a yoke or strap, and a split collar arranged ywithin the yoke and clamping the noscpicrc und engaging the cylinder to connect the nosc-pccc thereto.

lli. In a pneumatic hammer having :1 rotatable nosepiece arranged on the front end of the cylinder thereof to receive a drill or other working tool, a hand rotating deA .piecearranged on the front end of the cylinder thereof and adapted to receive a drill or working tool, a clamping vokc encircling the nose-piece and having a handlepicco y, ai two-part collar l-I within the yoke and adapted to engage the nose-piece and cylinder, and a screw 'or bolt for clamping the yoke onto the collar and thereby clamping the collar onto the nosepiece and cylinder.

18. In a pneumatic'hammer having a rotatable pose.- piece arranged on the front end of the cylinder thereof :nud adapted to receive a drill or working,r tool, u clampingr yoke encircling thc nose-piece and terminating :it its ends respectively in a handle-piece, g, and an extension y', a

vtwo-part collar within the yoke to engage the nose-picco and' cylinder, and a single screw engaging the extension g', and the handle g for drawing them together and thereby lclamping the yoke upon the collar.

19. The combination, with the hammer cylinder A having the anmilar groove a, of a nose-piece F having a for- Wardly facing shoulder f, a collar H having a shoulder h engaging the shoulder f and also having a llangc ll1 engaging the groove a, a yoke G encircling the collar and having an internal groove g2, said collar having a lian-ge hl 'received by the groove g2, a handle g on the yoke, and u single screw I engaging theyoke to clamp it to the collar and the latter to the nose-piece.

' ALFRED J. DOUGII'LY. Witnesses:

GEO. B. Cnarfr, HAMILTQNA. CONNOR. 

